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Speaking to the Telegraph, Robben said: "I think they have improved again compared to last year and, of course, we have faced them over the last few years and have always won or went through to the next round.

"But I think this is maybe going to be the most difficult one because of their status at the moment.

"Their level has risen again… They are a threat to everybody who is in the Champions League, they can make it difficult for everyone.

"We are confident, of course, but it’s going to be a 50/50 one."

Gabriel tries to hold of Robben in 2015 (Photo by David Price/Arsenal FC via Getty Images)

Robben has played in five of the last six encounters with his only goal in those games coming in the last meeting between the two in November 2015.

It is one of the most played fixtures in the Champions League in recent seasons and Robben admits he would rather come up against different opposition.